Ok sir. Explain to us how a plug-in UPS provides common mode
protection. Also cite the manufactuer's spec that claims that
common mode protection (and good luck).

Also please explain how those 130 ohms impedance in 50' of
12 AWG wire is not significant when earthing even a trivial
100 amp surge?

In the meantime, please explain how earth ground at a hydro
electric plant is at all related to single point earth ground
for a building, for a PA or stereo system, for the PC board
layout of A/D converters, or any other simple electronic
system where ground loops can be a problem. You do understand
the concept of ground loop? Good. Please then show us how
the ground at a power station has any relevance?

Now for the completely irrelevant topic of ground in an
airplane:


Ron Reaugh wrote:
"w_tom" wrote in message
...
There is nothing cost effective adjacent to the computer. No
UPS nor power strip protector that will protect computer
hardware.

That's simply wrong/false. A good UPS or good surge
protector WILL protect a PC. Do you understand the concept
of common mode?

Computer internal protection assumes the building
has implemented a 'whole house' protector on AC mains
connected less than 10 feet to central earth ground.

That's simply wrong/false. There is nothing magic about 10
feet except that an electrical pulse travels about that far
in 10 nanoseconds. What do you suppose the risetime of a
lightening bolt is and how does that relate to that 10
feet? Define "central earth ground" and what it's
important characteristics are. Where is the "central earth
ground" on an airplane, car, ISS or on the Antartic pole
US base(over a mile thick cold pure ice)? Are all PCs and
electronics gadgets there doomed? Ever heard on the concept
of a Farady cage?

Protection as it was even done and well proven before WWII.

Yes, for those who actually understand it. What does the
"central earth ground" look like at a major power station,
substation or hydroelectric dam? Where's it located?